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- W1536435900 abstract "Binding of IL-2 to its receptor activates several biochemical pathways, including JAK-STAT, Ras-mitogen-activated protein kinase, and phosphatidylinositol 3'-kinase (PI 3'-kinase) pathways. Recently, it has been shown that the SH2-containing phosphatase, SHP-2, becomes phosphorylated in response to IL-2 stimulation, associates with PI3'-kinase and Grb2, and can exert a positive regulatory role in IL-2 signaling. We now report the identification of a prominent 98-kDa protein (p98) found to be phosphorylated in response to IL-2 stimulation and coprecipitated with SHP-2, the p85 subunit of PI 3'-kinase and Grb2. Interestingly, whereas IL-4 is known to activate PI 3'-kinase, we did not observe any p98 phosphorylation in response to IL-4 stimulation. p98 can form a multipartite complex with all these proteins as immunodepleting with anti-p85 antiserum substantially reduced the amount of p98 immunoprecipitated by SHP-2 and Grb2; the converse was also true. Furthermore, phosphorylation of p98 did not occur in cells lacking JAK3, suggesting that it may be a JAK substrate. Finally, deglycosylation of p98 did not alter its migration, suggesting p98 is not a member of the recently described SHP substrate/signal-regulatory proteins family of transmembrane glycoproteins. Thus p98 is a prominent IL-2-dependent substrate that associates with multiple proteins involved in IL-2 signaling and may play an important role in coupling the different signal transduction pathways activated by IL-2." @default.
- W1536435900 created "2016-06-24" @default.
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- W1536435900 date "1999-02-15" @default.
- W1536435900 modified "2023-10-01" @default.
- W1536435900 title "IL-2, But Not IL-4 and Other Cytokines, Induces Phosphorylation of a 98-kDa Protein Associated with SHP-2, Phosphatidylinositol 3′-Kinase, and Grb2" @default.
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- W1536435900 doi "https://doi.org/10.4049/jimmunol.162.4.2081" @default.
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